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Firewall fails to block an established UDP connection...

GreatByte
Hello Guys,

I am have a weird situation here. I have a PC communicating with a server, both connected to my Sophos Firewall (Firmware: 9.100-16 - not an appliance).

I have a Rule that allows this connection, and it works. Without that Rule, the connection cannot be established. So far so good.
Once established, however, the communication continues even if I disable that rule, or add a rule above it to block that connection. [:S]
It just keeps on working and there doesnt seem to be a way to block it if I wanted to...

I tried it using a PC connected via the Internet and I can even disable the DNat Rule and the connection still continues. Only new connections are being blocked. Is this an expected behavior? Doesnt seem right to me.

Greatbyte


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    Anybody care to pontificate on the values and detriments of adding a conntrack -F on an hourly or every 30 minutes through cron?   I realize it would drop established connections, but wouldn't they just re-establish if there are no firewall rules to block?  Then, time based rules would work as advertised.  Thinking...
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  • 0
    Anybody care to pontificate on the values and detriments of adding a conntrack -F on an hourly or every 30 minutes through cron?   I realize it would drop established connections, but wouldn't they just re-establish if there are no firewall rules to block?  Then, time based rules would work as advertised.  Thinking...
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